This is from a Czech show, První krok, which is a remake of the spanish show un paso adelante. The show is about aspiring actors/dancers at a college specializing in this. In this scene, one of the students is nervous about having to do a performance in the nude, so her roommate tries helping her by convincing her they should both strip down and step out into the hallway together. The nervous one agrees, but chickens out at the last minute, locking her friend out in the hall naked.
This is from the second episode - which I have tried to find with no avail. If anyone can find it anywhere please post it here or DM me, because there's a scene later on in the same episode where the nervous actress' clothes get stolen while she is showering, and she has to walk back to her room in only a towel, which she drops in front of a teacher.
Spanish version of this scene:
https://www.youtube.com/watch?v=zreIV9dsT2c
And the clothes stolen:
https://www.youtube.com/watch?v=fHJ_bwzq6a4